JP5990649B2 - Lighting device suitable for multiple voltage sources - Google Patents

Description

  The present invention relates to a lighting device for a plurality of voltage sources. The invention further relates to a circuit and device for such a lighting device.

  US 8,004,210 B2 discloses a rectifier circuit in the form of a diode bridge for a light emitting diode which replaces a low voltage lamp.

  Usually, a transformer is used to supply power to a low voltage lamp such as a halogen lamp. The transformer is generally connected to an AC power supply voltage. If the low voltage lamp is replaced with a lighting device having one or more light emitting diodes without replacing the transformer, problems may arise due to the fact that the lighting device may behave differently than the behavior of the low voltage lamp. One or more light emitting diodes exhibit a voltage / current behavior different from that of a low voltage lamp. In addition, there are many transformers and other voltage sources, each with specific characteristics and specifications. The lighting device should work with most of these voltage sources. In general, it is impossible to determine in advance with which voltage source the retrofit lighting device must function. Furthermore, inter alia, electronic transformers require a minimum load to maintain high frequency vibrations. In combination with certain transformers and other voltage sources, this can lead to sub-optimal behavior of the lighting device, such as flicker. In particular, the frequency of the voltages supplied by the different voltage sources can be very different.

  DE19604026 A1 discloses a circuit comprising a rectifier and a capacitor in parallel with the rectifier. The capacitor receives a voltage signal from the rectifier. Second and third capacitors in parallel with the two diodes of the rectifier are provided to increase the voltage.

  US6272032 B1 discloses a rectifier with a parallel capacitor. Furthermore, a polarity reversing capacitor is provided in parallel with the diode of the rectifier.

  GB2454217 A also discloses a rectifier circuit having a diode. A capacitor is provided in parallel with at least one of the diodes.

  It is an object of the present invention to provide an improved lighting device that is suitable for use in combination with a plurality of voltage sources, especially a plurality of transformers. Another object of the present invention is to provide a circuit and device to be used in a lighting device.

According to the first aspect, the illumination device suitable for the plurality of voltage sources supplying the first voltage signal is
A first circuit coupled to an input terminal for receiving the first voltage signal from the voltage source, the diode for rectifying the first voltage signal and supplying a second voltage signal; A first circuit having a first capacitor for buffering two voltage signals, and a second capacitor coupled in parallel to one of the diodes of the first circuit;
A second circuit for receiving an input voltage signal corresponding to the second voltage signal and converting the input voltage into an output signal;
An illumination circuit having at least one light emitting diode and receiving the output signal of the second converter;
The first circuit has a fourth circuit provided in parallel with the second capacitor, and the fourth circuit has at least two diodes and is connected to the input terminal by the fourth capacitor; .

  The diode circuit rectifies a first voltage signal coming from a voltage source such as, for example, a transformer or another voltage-to-voltage converter, and provides a second voltage signal to the first capacitor. The first capacitor buffers the second voltage signal and supplies a second voltage buffered in a second circuit, such as a voltage / current converter, for supplying power to an illumination circuit having at least one light emitting diode. Supply signal. By introducing a second capacitor coupled in parallel to (just) one of the diodes of the diode circuit, the first circuit has an amplitude of the first voltage signal of the voltage source: Even when the magnitude of the second voltage signal buffered by the first capacitor is smaller, it is possible to draw a load current from the voltage source and transmit the energy from the voltage source to the input of the second circuit. Become. This can be defined as a charge pump effect. In particular, if the voltage source is an electronic transformer, it is possible to meet the minimum load requirement of the electronic transformer over an enlarged range of the amplitude of the first voltage signal of the electronic transformer. More specifically, the electronic transformer is around the peak of the power supply voltage supplied to the electronic transformer from the start of the vibration of the electronic transformer following the zero crossing of the power supply voltage supplied to the electronic transformer. Up to the point where the amplitude of the output voltage reaches its peak value and beyond. The reason for this is that during the first part of the switching cycle of the first voltage signal, the second capacitor is filled with energy, and during the second part of the switching cycle of the first voltage signal, the second capacitor is The goal is to keep this energy. The first circuit according to the invention comprising a fourth circuit serves as a quadruple voltage regulator with rectification. This configuration allows the electronic transformer to oscillate sustainably at lower voltage levels immediately after the zero crossing (at about 25% of the peak voltage). The efficiency and overall behavior of the lighting device is improved.

  Each diode may be a real diode, a Zener diode or a Schottky diode, or may be (a part of) a transistor, or may be made in another way as long as it exhibits diode behavior. The diode circuit may be a diode bridge or may be created in other ways as long as it exhibits rectifier behavior. The first voltage signal is, for example, an alternating current (AC) voltage signal, and the second voltage signal is, for example, a direct current (DC) voltage signal.

  In an embodiment of the lighting device, the first input terminal of the input terminal is coupled to the first output terminal of the output terminal via a first diode, and the output terminal of the output terminal is coupled via a second diode. The second output terminal is coupled to the first output terminal via a third diode, and the second output terminal of the input terminal is coupled to the first output terminal via the fourth diode. And one of the diodes is defined as the first diode.

  An embodiment of the rectifier circuit is defined such that the rectifier circuit has a third capacitor coupled in parallel to another one of the diodes. The third capacitor will enhance the charge pump effect.

  In an embodiment of the lighting device, the first input terminal of the input terminal is coupled to the first output terminal of the output terminal via a first diode, and the output terminal of the output terminal is coupled via a second diode. The second output terminal is coupled to the first output terminal via a third diode, and the second output terminal of the input terminal is coupled to the first output terminal via the fourth diode. And one of the diodes is the first diode and another of the diodes is the second diode. This diode circuit is a diode bridge.

  In an embodiment of the lighting device, the second and / or third capacitor is in series with a series diode, and a conductive path is connected to the second capacitor or the node between the third capacitor and its series diode. , It is defined as having a diode between the input terminal.

  An embodiment of the lighting device has a fourth circuit provided in parallel with the second capacitor or the third capacitor, and the fourth circuit has at least two diodes and is input by the fourth capacitor. It is specified that it is connected to the terminal.

  In an embodiment of the lighting device, a fifth circuit is provided in parallel to the second capacitor or the third capacitor, the fifth circuit has at least two diodes, and an input terminal is provided by the fifth capacitor. It is prescribed that it is connected to.

  The embodiment of the lighting device is defined such that the fourth circuit is provided in parallel with the second capacitor, and the fifth circuit is provided in parallel with the third capacitor.

  An embodiment of the lighting device is defined that the first circuit further comprises a third circuit for improving compatibility with the voltage source.

  An embodiment of the lighting device is defined that the second voltage signal to be buffered is 130% or less of the peak value of the first voltage signal.

  An embodiment of the lighting device is approximately equal to or more than the output power of the lighting circuit multiplied by a constant value (CV) and divided by the product of the peak value of the first voltage signal and the maximum first voltage signal application frequency. A plurality of voltages that provide a first voltage signal within a certain frequency range by a small sum of the capacitances of the capacitors of the first circuit, not including the capacitances of the first capacitors. Specified to be suitable for use with the source.

  An embodiment of the lighting device provides that the constant value (CV) is selected in the range of 0,001 to 0,100, preferably in the range of 0,003 to 0,03, and most preferably about 0,01. Is done.

  According to the second aspect, a first circuit suitable for use in a lighting device is provided.

  According to a third aspect, there is provided an apparatus having the first circuit and the second circuit suitable for use in a lighting device.

  An embodiment of the apparatus provides that the second circuit is a converter for converting an input DC voltage signal to an output DC signal, and that the input DC voltage signal corresponds to the buffered second voltage signal. Is done.

  In an embodiment of the first device, the output DC signal is an output DC current signal for a lighting circuit having at least one light emitting diode, and the second converter is configured to output the output DC current signal for control purposes. It is specified that it is designed to measure the amplitude of.

  The insight is that lighting circuits having one or more light emitting diodes may behave differently than low voltage lamps such as halogen lamps. The basic idea is that the charge pump capacitor (second and other capacitors) coupled in parallel to one of the diodes of the diode circuit is such that the amplitude of the first voltage signal of the voltage source is Even when the magnitude of the second voltage signal buffered by the first capacitor is smaller, it is possible to draw a load current from the voltage source and transfer the energy from the voltage source to the input of the second circuit. That's it. The lighting device of the present invention comprising a buffer capacitor and one or more charge pump capacitors is suitable for use with a plurality of voltage sources, in particular a voltage source comprising a plurality of said first voltage signals of different frequencies and / or amplitudes. Is suitable. The lighting device is particularly suitable for use in combination with an electronic transformer. Depending on the specific configuration of the lighting device (1, 2, 3 or 4 charge pump capacitors), there is already sufficient load for sustained oscillation from the electronic ballast at a relatively low voltage. You will get. The electronic ballast may be started, for example, at 25% or 50% of the peak voltage amplitude.

  The problem of providing an improved lighting device has been solved. Another advantage is that the inrush current signal coming from the first circuit can be limited by the charge pump capacitor (second and other capacitors), and the solution of adding a charge pump capacitor is the diode circuit and the It is more economical and more robust than another solution that adds a power modulation stage to the buffer capacitor (first capacitor).

  In addition, a range of voltage source characteristics defined by the amplitude and frequency of the voltage signal, as well as the accumulated capacitance of several charge pump capacitors in an appropriate relationship with the output power of the lighting device. By having this, it would optimize the charge pump effect, prevent substantial over-boosting of the buffer capacitor, and achieve that the electronic transformer starts oscillating and persists immediately after the zero crossing .

  These and other aspects of the invention are described and elucidated with reference to the following examples.

An outline of the circuit is shown. The Example of a 2nd circuit is shown. 1 shows a first embodiment of a first circuit. 2 shows a second embodiment of the first circuit. The waveform of a prior art is shown. Shows improved waveform. 3 shows a third embodiment of the first circuit. 4 shows a fourth embodiment of the first circuit. 5 shows a fifth embodiment of the first circuit. 6 shows a sixth embodiment of the first circuit. 7 shows a seventh embodiment of the first circuit. The Example of a 3rd circuit is shown.

  FIG. 1 shows an outline of the circuit. A voltage source 21, for example a magnetic transformer, an electronic transformer such as a switch mode power supply, or a voltage / voltage converter such as a fluorescent lamp stabilizer is coupled to the first circuit 1. The first circuit 1 is further coupled to a second circuit 22 such as a voltage / current converter. The second circuit 22 is further coupled to a lighting circuit 30 having at least one light emitting diode of any type, typically two or more light emitting diodes in any combination. In another example, the second circuit 22 may be a voltage / voltage converter.

  FIG. 2 shows an embodiment of the second circuit. The first input terminal is coupled to the normal input of chip 26, the first side of zener diode 23, the first side of resistor 25, and the first side of capacitor 24. Another side of resistor 25 is coupled to the first output terminal and the detection input of chip 26. The second input terminal is coupled to the ground input of chip 26 and another side of capacitor 24. Another side of zener diode 23 is coupled to another output of chip 26 and one side of inductor 27. Another side of inductor 27 is coupled to the second output terminal and is coupled to the first output terminal via capacitor 28. The second circuit 22 is a voltage / current converter. Chip 26 is a common chip in the industry. The first and second input terminals of the second circuit 22 should be coupled to the output terminals of the rectifier circuit 1 shown in FIGS. The first and second output terminals of the second circuit 22 should be coupled to the terminals of the lighting circuit 30. Many variations of this second circuit 22 will be available to those skilled in the art.

  FIG. 3 shows a first embodiment of the first circuit 11. The first circuit 1 has a diode circuit coupled to the input terminals 2, 3 of the first circuit 1 for receiving a first voltage signal from the voltage source 21. The diode circuit has diodes 11 to 14 for rectifying the first voltage signal and is coupled to the output terminals 4 and 5 of the first circuit 1 for supplying the second voltage signal. The first circuit 1 further comprises a first capacitor 15 coupled to the output terminals 4, 5 for buffering the second voltage signal and supplying the buffered second voltage signal to the second circuit 22. The first circuit 1 further comprises a second capacitor 16 coupled in parallel to (just) one of the diodes 11 to 14 to provide a charge pump effect.

  Preferably, the first input terminal 2 of the input terminals 2, 3 is coupled to the first output terminal 4 of the output terminals 4, 5 via the first diode 11 and is output via the second diode 12. The terminals 4 and 5 are coupled to the second output terminal 5. The second input terminal 3 of the input terminals 2 and 3 is coupled to the first output terminal 4 through the third diode 13 and is coupled to the second output terminal 5 through the fourth diode 14. The one of the diodes 11-14 can be, for example, the first diode 11, but could be any other one of the diodes 11-14.

  In FIG. 4 a second embodiment of the rectifier circuit 1 is shown. This second embodiment includes a third capacitor 18 coupled in parallel with the second diode 12 to enhance the charge pump effect, in addition to a second capacitor 17 coupled in parallel with the first diode 11. 3 is different from the first embodiment shown in FIG. Each capacitor 17 and 18 is coupled in parallel to each diode 11 and 12, or vice versa, and each capacitor 17 and 18 is in parallel to each diode 13 and 14. Good results are achieved when combined or vice versa. The first circuit of this embodiment serves as a voltage doubler with peak rectification.

  FIG. 5 shows waveforms of the prior art. The upper graph shows the buffered second voltage signal across the first capacitor 15 versus time. The next graph shows the input current signal versus time flowing through the input terminals 2 and 3. The lower graph shows the output current signal versus time flowing through the lighting circuit 30. Clearly, the buffer second voltage signal has a relatively low average value, the input current signal has a relatively short and high peak, and the output current signal has a value that the buffer second voltage signal is too low. If interrupted.

  FIG. 6 shows an improved waveform for a rectifier circuit as shown in FIG. Again, the upper graph shows the buffered second voltage signal across time across the first capacitor 15 versus time. The next graph shows the input current signal versus time flowing through the input terminals 2 and 3. The lower graph shows the output current signal versus time flowing through the lighting circuit 30. Clearly, the buffer second voltage signal has a relatively high average value compared to the prior art buffer second voltage signal, and the input current signal is smoother than the prior art input current signal. The output current signal is no longer interrupted. This is a great advantage.

  The first capacitor 15 can have a value of 470 μF, and the second and third capacitors 16 to 18 can each have a value of 22 nF, but other values should not be excluded, many Other values may be acceptable.

  FIG. 7 shows a third embodiment of the first circuit. In addition to the second embodiment of FIG. 4, a fourth capacitor 53, a fifth capacitor 54, a fourth circuit 51, and a fifth circuit 52 are provided. The fourth capacitor 53 and the fifth capacitor 54 are disposed between the input terminals 2 and 3 and the fourth circuit 51 and the fifth circuit 52, respectively. The fourth circuit 51 and the fifth circuit 52 are respectively in parallel with the second capacitor 17 and the third capacitor 18, and both have at least two diodes 56 to 59. In this configuration, the first circuit 1 serves as a quadruple voltage regulator with peak rectification. This configuration allows the electronic transformer to oscillate sustainably at a lower voltage level immediately after the zero crossing (at about 25% of the peak voltage), increasing the efficiency of the lighting device and overall Improve the behavior.

  The fourth embodiment of FIG. 8 also provides a quadruple voltage regulator with peak rectification.

  The third and fourth embodiments will provide better characteristics than the second embodiment of the first circuit, but will be more expensive. The present invention offers the possibility of having a first circuit that is customized in accordance with the desired characteristics of the lighting device, especially in terms of cost. Within the scope of the present invention, there may be several more complex or less complex configurations with unique features that do not affect the basic functions of the lighting device and the first circuit. Among other things, the number of capacitors can be selected in relation to a particular function. Several configurations are possible within the concept of the invention. For example, up to tripler can be made with two charge pump capacitors, or up to quadrupler can be made with three charge pump capacitors.

  The fifth embodiment of FIG. 9 differs from the third embodiment in that the diodes 11 and 12 are omitted. In this configuration, voltage peak rectification occurs along the diodes 56-59, and this configuration is still operating as a quadrupler.

  In the sixth embodiment as shown in FIG. 10, two capacitors 17 and 54 serve as a triple voltage regulator.

  Finally, FIG. 11 shows the configuration of the first circuit including only one capacitor (second capacitor 16) in parallel with the diode 13. In series with the second capacitor 16, a conductive path including a diode 64 is provided between the node between the second capacitor 16 and the series diode 62 having the series diode 62 and the input terminal 2. The second capacitor 16 is charged to the instantaneous AC peak voltage via the diode 64. When the polarity of the voltage source 21 is reversed, charge is supplied to the first capacitor 15 via the diode 12, the voltage source 21, the second capacitor 16, and the diode 64.

  According to the invention, the configuration is the output power of the lighting circuit multiplied by a constant value (CV) and divided by the product of the peak value of the first voltage signal (in V) and the maximum first voltage signal applied frequency (Hz). Can be further optimized by the sum of the capacitance (in As / V) of the capacitor of the first circuit (not including the capacitance of the first capacitor 15), approximately equal to or smaller than (in W). . Surprisingly, it has been found that a constant value (CV) (in 1 / V units) selected within the range of 0,001 to 0,100 significantly improves the performance of the luminaire. With a constant value (CV) in the range of 0,003 to 0,03, further optimization can be achieved, and the best performance was observed at a constant value of about 0,01.

  FIG. 12 shows third circuits 41 to 42 for improving compatibility with the voltage source 21. The third circuits 41 to 42 are located between, for example, the voltage source 21 and the first circuit 1, and are connected to the output terminal of the voltage source 21 (and the input terminals 2 and 3 of the rectifier circuit 1) and the resistor 41. The unit 42 has a series connection. In another example, the third circuits 41 to 42 may form part of the first circuit 1. In some cases, the inductor 43 and / or resistor 44 as shown may have one side of the series connection coupled to the input terminal 3 more directly on the other side of the series connection. A third circuit 41 to 44 can be added to couple to the input terminal 2.

  (A) The third circuits 41 to 42 can change the phase of the output current signal of the first circuit 21 (the self-excited oscillating transformer has two conditions: The fact that a specific phase and a specific amplitude of the current signal are required) and / or (b) the third circuits 41 to 42 can affect the amplitude of this output current signal (for high frequencies, The third circuit 41 to 42 is a low impedance path that loads the voltage source 21 so that the amplitude of the output current signal is greater and the vibrational state is improved) and / or (c) the third The compatibility is improved here by the fact that the circuits 41 to 42 can provide a low impedance path (at the end) during switching of the voltage source 21, for example in the form of an electronic transformer. The third circuits 41 to 42 can improve the compatibility with the voltage source 21 regardless of the presence or absence of the capacitors 16 to 18. To improve compatibility with a particular voltage source 21, the capacitor 41 can have a value of 4.7 nF, and the resistor 42 has a value of 10 ohms (in the case of the inductor 43 it has a value of 2.2 μH). However, other values should not be excluded and other values may be required for other types of voltage sources 21.

  In summary, the first circuit 1 includes a voltage source circuit 21 such as a voltage / voltage converter. The diode circuit has diodes 11-14 for rectifying the first voltage signal and is coupled to the output terminals 4, 5 for supplying a second voltage signal. To supply a buffered second voltage signal to a second circuit 22, such as a voltage-to-current converter, for buffering the second voltage signal and feeding a lighting circuit 30 having one or more light emitting diodes. A first capacitor 15 is coupled to the output terminals 4 and 5. Additional capacitors 16, 17, 53, 54 are provided in the first circuit to provide a charge pump effect and improve the performance of the first and second circuits 21, 22 and the lighting circuit 30.

  It will be apparent from the above that additional doublings (5 ×, 6 ×, etc.) can be achieved by adding even more charge pump capacitors.

  While the invention is illustrated in the drawings and has been described in detail in the foregoing description, such illustration and description are to be considered illustrative and exemplary and limited Should not be considered. The invention is not limited to the disclosed embodiments. Those skilled in the art in practicing the claimed invention may understand and achieve other variations to the disclosed embodiments from a study of the drawings, the specification, and the appended claims. In the claims, the word “comprising” does not exclude other elements or steps, and the singular form does not exclude the presence of a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. Any reference signs in the claims should not be construed as limiting the scope.

Claims (11)

A lighting device suitable for a plurality of voltage sources for supplying a first voltage signal,
A first circuit coupled to an input terminal for receiving the first voltage signal from the voltage source, the diode for rectifying the first voltage signal and supplying a second voltage signal; A first circuit having a first capacitor for buffering a voltage signal and a second capacitor coupled in parallel to one of the diodes of the first circuit;
A second circuit for receiving an input voltage signal corresponding to the second voltage signal and converting the input voltage signal into an output signal;
A lighting device having at least one light emitting diode and receiving the output signal of the second circuit ,
The first circuit includes a fourth circuit provided in parallel with the second capacitor, and the fourth circuit includes at least two diodes and is connected to the input terminal by the fourth capacitor. apparatus. The first input terminal of the input terminal, via the first diode being coupled to the first output terminal of the output terminal, via the second diode is coupled to the second output terminal of said output terminals The second input terminal of the input terminal is coupled to the first output terminal via a third diode, and is coupled to the second output terminal via a fourth diode. The lighting device described. The lighting device of claim 1, wherein the first circuit comprises a third capacitor coupled in parallel to another one of the diodes. The first circuit has a fifth circuit provided in parallel with the third capacitor, and the fifth circuit has at least two diodes and is connected to the input terminal by the fifth capacitor. The lighting device according to claim 3. 5. The lighting device according to claim 1, wherein the second voltage signal to be buffered is 130% or less of a peak value of the first voltage signal. 6. A static value of the capacitor of the first circuit that is multiplied by a constant value and is approximately equal to or less than the output power of the lighting circuit divided by the product of the peak value of the first voltage signal and the maximum applied frequency of the first voltage signal. The sum of capacitances, the sum of which does not include the capacitance of the first capacitor, is suitable for use with a plurality of voltage sources providing a first voltage signal within a frequency range. The illumination device according to any one of 1 to 5. 7. The lighting device according to claim 6, wherein the constant value is selected within the range of 0,001 to 0,100, preferably within the range of 0,003 to 0,03, and most preferably about 0.01. The 1st circuit suitable for use in the illuminating device as described in any one of Claims 1 thru | or 7. The apparatus which has an illuminating device as described in any one of Claims 1 thru | or 7. The apparatus of claim 9, wherein the second circuit is a converter for converting an input DC voltage signal to an output DC signal, the input DC voltage signal corresponding to the buffered second voltage signal. The output DC signal is an output DC current signal for a lighting circuit having at least one light emitting diode, and the second converter is designed to measure the amplitude of the output DC current signal for control purposes. The apparatus of claim 10 .

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